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J. D.v WESTGATB.

CLUTCH.

No. 386,948. A Q5 Patented July 31, 1888.

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J. D. WESTGATE.

CLUTCH.

No. 386,948. Patented July 31, 1888.

K @BMJ @www A mmm UNITED STATES PATENT GEEicE.

JOSEPH D. WESTGATE, OF VORGESTER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TOARGALIS P. BUTLER, OF SAME PLACE.

CLUTCH.

SPECIFICATION forming part of Letters Patent No. 386,948, dated July 31,1888.

Application filed December 5, 1887.

T0 all whom it may concern,.-

Be it known that l, Josnrn D. WEsTcArE, a citizen of the United States,residing at Torcester, in the county of W'orcester and State ofMassachusetts, have invented anew and use ful ImprovementinFrietionClutches, of which the following is a specification, referencebeing had to the accompanying drawings, in which- Figure l is anelevation with the inclosiugplate D removed. Fig. 2 isa centralsectional view on line X X, Fig. l. Fig. 3 showsa detached View of thefriction ring or strap; and Fig. 4 is an elevation with theinclosing-plate D in section, and showing my improved means foractuating the clutch by means of an eccentric. Fig. 5 is aface View, aportion of the inclosing-plate D being removed to show the relation ofthe eccentric with respect to lever g', which it actuates. Fig. 6 is asectional View of the actuatingeccentric on line Y Y, Fig. 7, and Fig. 7is an end view ofthe actuating eccentric.

Like letters refer to like parts in the several views.

My invention relates to a frictionclutch in which a frictionstrap iscompressed upon an interior drum attached to the shaft by suitableactuating mechanism, and in which the continued movement of therevolving pulley is made to operate a locking mechanism, by which themotion of the pulley is positively communicated to the shaft.

A denotes the shaft, upon which is fastened the drum B, about which Iplace the elastic friction ring or strap C.

D is a plate covering the side of the pulley E and attached to the webof the pulley by screws a a a. The pulley E runs loosely on the hub b ofthe interior drum, B, and is held in place by the collar c, attached tothe shaft A. The elastic strap C is constructed as is usual i ufriction-clutches, and consists of a metallic ring open at one side, toallow the ends to be brought together, causing the ring to be compressedupon the outer surface ofthe interior drum, B. The means employed by meto effeet the compression of the elastic ring I be` lieve to be new.

The open ends ofthe ring are made to overlap each other at l d', andeach end is provided with a lug, c c', at right angles to the ring,andpresenting theopposing surfacesff,

(No model.)

between which I place a bar, g, loZenge-shaped in its erosssection andhaving the bent lever g attached to its outer end and carried over thecenter of the shaft A, the end g2 of the bent lever having a roll, f/,journaled in the end of the lever and with its surface projecting torest upon the sliding cone F, which is capable of being moved on theshaft A bythe ordinary shipping mechanism for the purpose of raising theend g2 of the bent lever g and rotating the lozenge-shaped bar g. rlherotation of the bar g will cause its acute-angled corners g to bebrought against the opposing surfaces ff of the lugs c c', therebydrawing the ends d d of the elastic friction ring or strap C togetherand compressing the strap upon the outer or friction surface ofthe drumB. To the friction-strap G, I attach au elastic strap, G, which extendseonceutrically partially around the frietionvstrap C, and is provided atits free end with a neck, G, at an oblique angle to a radiusline passingthrough the end of the strap G and indicated in Fig. 1 by the brokenline s. The neck G' is held in an opening, G2, in a flange, H, attachedto the web of the pulley E, and outside the liange H is a head, G. Aportion of the face of the drum B has a series of notches placed atequal intervals around the drum B and adapted to receive the tooth J,attached to the underside of the strap G.

The operation of the clutch is as follows: The sliding cone F is movedalong the shaft A beneath the free end g2 of the bent lever g', causingapartial rotation of the lozenge-shaped bar g, bringing the acute-angledcorners g4 against the opposing surfaces ff of the lugs e c and drawingthe frictionstrap G tightly on the surface of the drum B. This serves tohold the attached end of the strap G from ro JDating around the drum B,while the continued motion of the pulley E will cause the end h of the[lange H to slide upon the oblique neck G and carry the free end ol' thestrap G inward toward the position indicated by the broken lines K, Fig.1, and carrying the tooth J into the first succeeding notch j in theface of the drum B in case there is any movement of the friction-strap Caround the drum B. /Vhenever the cone F is removed from beneath the endof the bent lever g', the friction-strap is ICO allowed to release itshold upon the surface of the drum B,and the elastic strap G will assumethe position shown in Fig. 1 of the drawings, withdrawing the tooth Jfrom the notches in the drum B. It will thus be seen that my im` provedclutch combines the features of a friction and a positive clutch. of theclutching mechanism is to attach the strap C to the outer surface of thedrum B by means of the friction between them, and the second action isto cause the continued n10- tion, if there is any, to carry the tooth Jinto one of the notches in the drum and effect a positive engagementbetween the pulley and the drum, which, being attached to the shaft A,will cause the rotation of the pulley to be imparted to the shaft A.

I have thus far described the operation of the clutching mechanism asactuated by the sliding cone F, which is a usual and wellknown method ofactuating a friction-clutch; but I prefer to actuate the clutch by meansof the device which is shown in Figs. 5, 6, and 7 of the drawings, inwhich E denotes the pulley and g the bent lever by which the elasticfriction-strap C is made to engage the drum Bin the same manner asalready described; butinstead of a sliding cone, F, I employ aneccentric, L, capable of a sliding motion on the shaft A, but made torotate with the shaft by means cfa spline, L. 'Ihe edge of the eccentricis beveled at L2, in order to cause it to pass readily beneath the endg2 of the bent lever y. A grooved hub, L3, extends from theside of theeccentric L to receive a shipper in the usual manner,and within the hubL3, I place a spiral spring, M, acting against a shoulder, M', on

the eccentric and a collar, M3, on the shaft A. When the spiral springis employed, the shipper must of course be locked in position to holdthe spring M from carrying the sliding eccentric beneath theend of thebent arm g'. When it is desired to operate the clutch, the shipper isreleased, allowing the spiral spring M to carry the eccentric L againstthe end of the bent arm g', pressing the beveled Aside L2 of theeccentric against the end of the arm until the arm g is brought by therotation of the i pulley opposite the thinner side N of the eccentric,when the eccentric L will be carried beneath the end g2 of the bent armg. As the arm g is then carried around the eccentric L by the rotationof the pulley E, it will be carried upon the thicker side of theeccentric, raising the arm and actuating the friction-strap in themanner already described. A very slight spring is required to carry theeccentric beneath the end of the bent lever when the end g2 arrives atthe thinner side N of the eccentric7 and the lever is then raised by therotation of the shaft itself.

The throw of the eccentric should be greater than is required to raisethe end of the bent lever g', in order to allow for any lost motion orwear of the parts.

I do not herein claim, broadly, the combination of a friction and alocking clutch, as

The first action such was shown in my application, Serial No. 237,932,filed May 12, 1887.

What I do claim, however, as of my present invention, and desire to secure by Letters Patent, is-

1. In a clutch,the combination, with a shaft,

and a friction-drum provided .with notches and attached to said shaft,of a revolving pulley provided with a slotted tiange and having aconcentric motion around the axis of said shaft, a friction-strap havingconnected operative mechanism, substantially as described, by which 'itis compressed around the outer surface of said friction-drum, an elasticarm integrally attached at one end to said frictionstrap, and having atits free end a tooth adapted to engage the notcheson said frictiondrum,and an oblique neck held in the slotted flange of said pulley,substantially as described.

2. In a clutch,the combination,with a shaft, of a drum attachedV to saidshaft, a frictionstrap capable of being compressed -on said drum, anelastic strap with one end integrally attached to said friction-strap,and the other end connected with the revolving pulley, and

a revolving pulley whose motion is imparted to said drum through saidelastic strap and said friction-strap, substantially as described.

3. In a clutch,the combination,with a shaft, of a drum attached to saidshaft, a frictionstrap inclosing said drum and provided with overlappingends and lugs presenting opposing surfaces, a bar inclosed in and heldby said overlapping ends and lugs, a lever attached to said bar andplaced at an angle therewith, and a sliding cone, all arranged andoperating substantially as described.

4. In a clutch,the combination,with an elastic friction-strap havingconnected actuating mechanism, substantially as described, and embodyinga lever extending over the shaft, of an eccentric rotated by the shaftand capable of sliding thereon, substantially as described.

5. In a clutch, the combination,with a lever extending over the shaftand having connected clutching devices, substantially as described,whereby the rotary motion of the pulley is imparted to the shaft, orvice versa, of an eccentric capable of sliding on the shaft but heldfrom rotating thereon, -by which said lever is raised radially from theshaft and the clutching devices operated thereby, substantially asdescribed.

6. In a clutch,the combination,with clutching devices, substantially asdescribed,where by the rotation of a pulley is imparted to a shaft, orvice versa, of a lever extending over the shaft and operativelyconnected with said clutching devices, mechanism by which said lever isactuated through a sliding motion on the shaft, and a spring applied tosaid actuating mechanism,whereby it is moved along the shaft and beneathsaid lever, substantially as described.

7. In a clutch, the comhination,with mech- IOC IIO

IIS

anism by which a rotating pulley is made to engage its shaft, or viceversa, of an eccentric capable of sliding on the shaft but held fromturning thereon, said eccentric having a beveled edge and connecteddevices, substantially as described,whereby it is moved on the shaft,substantially as described.

8. The combination, with a friction strap and an operating-lever bywhich said strap is operated, of the eccentric L, provided with a 1obeveled edge, L2', spring M, collar M, and connected devices,substantially as described, b v which said eccentric is moved againstsaid spring, substantially as described.

JOSEPH D. WESTGATE. Witnesses:

RUFUs B. FOWLER, H. W. FOWLER.

